2SA1742 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -100 V
• Emitter-Base Voltage, max: -7 V
• Collector Current − Continuous, max: -7 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 100 to 400
• Transition Frequency, min: 40 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.The 2SA1742 transistor can have a current gain of 100 to 400. The gain of the 2SA1742-K will be in the range from 200 to 400, for the 2SA1742-L it will be in the range from 150 to 300, for the 2SA1742-M it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA1742 might only be marked "A1742".The complementary NPN transistor to the 2SA1742 is the 2SC4550.You can replace the 2SA1742 with the 2SA1743, 2SA1744, BD204, BD304, BD536, BD538, BD544A, BD544B, BD544C, BD546A, BD546B, BD546C, BD798, BD800, BD802, BD808, BD810, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDX78, D45H11, D45H11FP, D45H8, MJE15029 or MJE15029G.